the only teaser there that grabs me is the ‘I looked into your eyes and saw my worst fears’ which goes with my sense that the Nightmare isn’t just her nickname as a highwayman, it’s the Doctor’s bad dream too.
But the trailer 11/12 seconds in – shot of a planet firing from the sky – caused an unexpected kick of adrenaline…

Whis

This is waaay out there but maybe Maisie Williams is The Nightmare Child?